This is a package that attempts to detect a browser vendor and version (in a semver compatible format) using a navigator useragent in a browser or process.version in node.

const { detect } = require('detect-browser');
const browser = detect();

// handle the case where we don't detect the browser
if (browser) {
  console.log(browser.name);
  console.log(browser.version);
  console.log(browser.os);
}

Or you can use a switch statement:

const { detect } = require('detect-browser');
const browser = detect();

// handle the case where we don't detect the browser
switch (browser && browser.name) {
  case 'chrome':
  case 'firefox':
    console.log('supported');
    break;

  case 'edge':
    console.log('kinda ok');
    break;

  default:
    console.log('not supported');
}

If you have been using 3.x the main thing to be aware of is that the bot boolean flag has been removed from all but the BotInfo results (yes, 4.x introduces some lightweight classes for identifying the type of result you have received).

In all but a few cases this change will be transparent to most users (given common JS coding pattern), but it's worth checking the release notes to get details on those edge cases.

Additionally, with the source now being written in TypeScript the package ships with type declarations so you shouldn't need the @types/detect-browser package anymore (thanks to those that put the effort into creating it though).

The current list of browsers that can be detected by detect-browser is not exhaustive. If you have a browser that you would like to add support for then please submit a pull request with the implementation.

Creating an acceptable implementation requires two things:

1. A test demonstrating that the regular expression you have defined identifies your new browser correctly. Examples of this can be found in the test/logic.js file.

2. Write the actual regex to the index.js file. In most cases adding the regex to the list of existing regexes will be suitable (if usage of detect-brower returns undefined for instance), but in some cases you might have to add it before an existing regex. This would be true for a case where you have a browser that is a specialised variant of an existing browser but is identified as the non-specialised case.

When writing the regular expression remember that you would write it containing a single capturing group which captures the version number of the browser.

The MIT License (MIT)

Copyright (c) 2019 Damon Oehlman [email protected]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.